Ugh. I hope I don’t get this way. I’ve seen some dementia patients get sweet as sugar and some get nasty as snakes and they have no control of which way it goes. Sounds like your MIL was predisposed to be mean by her behavior prior to old age. Cmon! $10 to deliver a crappy meal is ridiculous! What a rip off! She’s a stinker! That many years on Valium is bad news too. One 2mg tab would knock me out! My heart goes out to you both!